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Corporate Reorganization of the Telecom Group and Its controlling companies - Telecom Group Reorganization (Details) | May 23, 2017 Vote $ / shares shares | Dec. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares | Dec. 31, 2015 $ / shares
--- | --- | --- | --- | ---
Conversion terms approved by board |  |  |  |
Par value per share |  | $ 1 | $ 1 | $ 1
Telecom Argentina | Class "A" |  |  |  |
Conversion terms approved by board |  |  |  |
Par value per share | $ 1 |  |  |
Number of Votes Per Share | Vote | 1 |  |  |
Telecom Argentina | Class "A" | Maximum |  |  |  |
Conversion terms approved by board |  |  |  |
Number of shares to be converted | shares | 161,039,447 |  |  |
Telecom Argentina | Class "B" |  |  |  |
Conversion terms approved by board |  |  |  |
Par value per share | $ 1 |  |  |
Number of Votes Per Share | Vote | 1 |  |  |

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